d- and f-Block · Lanthanoid electronic configuration
Pairs of elements with the same number of electrons in their respective 4f orbital are
[Atomic number, Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72]
- (A)(Eu and Gd)
- (B)(Dy and Ho)
- (C)(Yb and Hf)
- (D)(Lu and Tm)
- (1)B and C Only
- (2)A and B Only
- (3)A and D Only
- (4)A and C Only
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